Patent US4720526A successfully refreshed from Google Patents.
US4720526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cured rubber compositions of high modulus
Assignee: Bridgestone Americas Tire Operations LLC
•
Filing: 1986-06-02
•
Granted: 1988-01-19
•
Expires: 2006-06-02
Abstract
Abstract Cured rubber compositions having modulii at 10% elongation of from about 50 MPa to about 200 MPa are prepared by curing, curable rubber compositions comprising: (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber, nitrile rubber, neoprene and blends thereof; (b) from about 50 to about 100 parts by weight of a metal dimethacrylate selected from the group consisting of zinc dimethacrylate and magnesium dimethacrylate and (c) from about 1.0 to about 6.0 parts by weight of a peroxide curing agent; at temperatures ranging from about 140° to about 180° C. for time periods ranging from about 10 to about 45 minutes. The curable rubber compositions may optionally and in some instances preferably contain from about 0.1 to about 2.0 parts by weight of a co-curing agent. Cured rubber compositions of the invention may be utilized in various applications including for example conveyor belts and tire compounds.
Inventors
- 👤 Charles M. Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:46
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/02; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
108 words
Cured rubber compositions having modulii at 10% elongation of from about 50 MPa to about 200 MPa formed by curing, curable rubber compositions comprising: (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber, nitrile rubber, neoprene and blends thereof; (b) from about 50 to about 100 parts by weight of a metal dimethacrylate selected from the group consisting of zinc dimethacrylate and magnesium dimethacrylate; and (c) from about 1.0 to about 6.0 parts by weight of a peroxide curing agent; at temperatures ranging from about 140° to about 180° C. for time periods ranging from about 10 to about 45 minutes.
Claim 2
Dependent Claim
108 words
Cured rubber compositions having modulii at 10% elongation of from about 50 MPa to about 200 MPa formed by curing, curable rubber compositions comprising: (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber, nitrile rubber, neoprene and blends thereof; (b) from about 50 to about 100 parts by weight of a metal dimethacrylate selected from the group consisting of zinc dimethacrylate and magnesium dimethacrylate; and (c) from about 1.0 to about 6.0 parts by weight of a peroxide curing agent; at temperatures ranging from about 140° to about 180° C. for time periods ranging from about 10 to about 45 minutes.
Claim 3
Dependent Claim
27 words
The cured rubber composition of claim 1 wherein said curable rubber composition further comprises from about 0.1 to about 2.0 parts by weight of a co-curing agent.
Claim 4
Dependent Claim
18 words
The cured rubber composition of claim 1 wherein the rubber of the curable rubber composition is natural rubber.
Claim 5
Dependent Claim
18 words
The cured rubber composition of claim 1 wherein the rubber of the curable rubber composition is nitrile rubber.
Claim 6
Dependent Claim
24 words
The cured rubber composition of claim 1 wherein the rubber of the curable rubber compostion is a blend of natural rubber and nitrile rubber.
Claim 7
Dependent Claim
19 words
The cured rubber composition of claim 1 wherein the metal dimethacrylate of the curable rubber composition is zinc dimethacrylate.
Claim 8
Dependent Claim
22 words
The cured rubber composition of claim 1 wherein the peroxide curing agent of the curable rubber composition is bis-(t-butyl peroxy) diisopropyl benezene.
Claim 9
Dependent Claim
30 words
The cured rubber composition of claim 1 wherein the co-curing agent of the curable rubber composition is selected from the group consisting of N,N'-meta-phenylene dimaleimide, triallyl isocyanurate, and mixtures thereof.
Claim 10
Independent Claim
127 words
A method for preparing a cured rubber composition having a modulus at 10% elongation of from about 50 MPa to about 200 MPa comprising the steps of: (1) preparing a curable rubber composition which comprises: (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber, nitrile rubber, neoprene and blends thereof; (b) from about 50 to about 100 parts by weight of a metal dimethacrylate selected from the group consisting of zinc dimethacrylate and magnesium dimethacrylate; and (c) from about 1.0 to about 6.0 parts by weight of a peroxide curing agent; and (2) curing said curable rubber composition at temperatures ranging from about 140° C. to about 180° C. for time periods ranging from about 10 to about 45 minutes.
Claim 11
Independent Claim
127 words
A method for preparing a cured rubber composition having a modulus at 10% elongation of from about 50 MPa to about 200 MPa comprising the steps of: (1) preparing a curable rubber composition which comprises: (a) 100 parts by weight of a rubber selected from the group consisting of natural rubber, nitrile rubber, neoprene and blends thereof; (b) from about 50 to about 100 parts by weight of a metal dimethacrylate selected from the group consisting of zinc dimethacrylate and magnesium dimethacrylate; and (c) from about 1.0 to about 6.0 parts by weight of a peroxide curing agent; and (2) curing said curable rubber composition at temperatures ranging from about 140° C. to about 180° C. for time periods ranging from about 10 to about 45 minutes.
Claim 12
Dependent Claim
29 words
The method of claim 9 wherein the curable rubber composition prepared in step (1) further comprises from about 0.1 to about 2.0 parts by weight of a co-curing agent.
Claim 13
Dependent Claim
16 words
The method of claim 9 wherein the rubber of the curable rubber composition is natural rubber.
Claim 14
Dependent Claim
16 words
The method of claim 9 wherein the rubber of the curable rubber composition is nitrile rubber.
Claim 15
Dependent Claim
22 words
The method of claim 9 wherein the rubber of the curable rubber composition is a blend of natural rubber and nitrile rubber.
Claim 16
Dependent Claim
17 words
The method of claim 9 wherein the metal dimethacrylate of the curable rubber composition is zinc dimethacrylate.
Claim 17
Dependent Claim
20 words
The method of claim 9 wherein the peroxide curing agent of the curable rubber composition is bis-(t-butyl peroxy) diisopropyl benezene.
Claim 18
Dependent Claim
28 words
The method of claim 10 wherein the co-curing agent of the curable rubber composition is selected from the group consisting of N,N'-meta-phenylene dimaleimide, triallyl isocyanurate and mixtures thereof.
References Cited (Backward Citations)
US4056269A
Cited
US4266772A
Cited
US4065537A
Cited
US4165877A
Cited
US4264075A
Cited
US4191671A
Cited
US4305851A
Cited
US4500466A
Cited
US4529770A
Cited
US4546980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |